长寿命铁-空气电池负极的热压烧结制备及其电化学性能研究  

Preparation of Long-Life Anodes for Iron-Air Batteryby Hot-Pressing Sintering and Its Electrochemical Performance Study

作　　者：张勇[1] 毕文浩 ZHANG Yong;BI Wenhao(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2025年第1期87-92,共6页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金项目(22075035);大连市科技基金项目(2022JJ11CG005);辽宁省教育厅科学研究计划项目(LJKFZ20220204)。

摘　　要：电化学钝化导致碱性铁-空气电池铁负极容量衰减。为了解决铁负极的电化学钝化难题,通过热压烧结工艺制备了块体Fe/S负极,对其进行了电化学反应前、后的XRD和SEM表征、循环伏安测试、低电流电极活化循环测试及0.2C和1C条件下100次循环测试。实验结果表明,Fe/S负极具有较大的容量和循环容量保持率,在60mAh/g的电流条件下,最大放电容量为563mAh/g,在0.2C和1C条件下最大放电容量分别为346mAh/g和159mAh/g,硫元素的引入能够有效解决铁电极钝化问题。与常规粉体铁电极相比,通过热压烧结制备的块体铁电极具有更好的组织致密性,可以抑制铁电极在溶解-沉积反应中的体积变化,从而提高铁-空气电池的循环稳定性。这项研究为长寿命金属空气电池的可控合成提供了有益思路和潜在应用价值。Aiming at electrochemical passivation causing the capacity decay of the iron negative electrode in alkaline iron-air batteries,bulk Fe/S anodes were prepared using a hot-pressing sintering process and characterized through XRD and SEM before and after electrochemical reactions.Additionally,cyclic voltammetry tests,low-current electrode activation cycling tests and 100 cycle tests at 0.2 C and 1 C conditions were conducted.Experiment results indicate that the Fe/S anodes exhibit high capacity and capacity retention rates.Under a current density of 60 mA/g,the maximum discharge capacity is 563 mAh/g,while the maximum discharge capacities are 346 mAh/g and 159 mAh/g respectively under 0.2 C and 1 C discharge conditions.The introduction of sulfur effectively addresses the passivation issue of the iron electrodes.Compared to conventional powdered iron electrodes,the bulk iron electrodes prepared through hot-pressing sintering exhibit better structural density,which can suppress the volume changes of the iron electrodes during dissolution-deposition reactions,eventually improving the cycling stability of iron-air batteries.This study provides valuable insights and potential application value for the controlled synthesis of long-life metal-air batteries.

关 键 词：铁-空气电池 负极 铁硫化物 热压烧结 

分 类 号：TM9[电气工程—电力电子与电力传动]